Bell Ringer

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# Bell Ringer - PowerPoint PPT Presentation

SC.7.P.11.4: Observe and describe that heat flows in predictable ways, moving from warmer objects to cooler ones until they reach the same temperature. . Bell Ringer.

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SC.7.P.11.4: Observe and describe that heat flows in predictable ways, moving from warmer objects to cooler ones until they reach the same temperature.

Bell Ringer
• 1. Anna pours herself some room-temperature soda from a bottle and adds four ice cubes. In a few minutes the ice cubes are smaller and the soda is much colder. Which of the following best explains the change in temperature of the soda?
• Heat flowed from the soda to the ice cube and caused it to partially melt.
• Coldness flowed from the ice cube to the soda, making the soda colder.
• The cold water from the melting ice went into the soda, replacing the warmer water that was in the soda.
• The water from the melting ice makes the soda more dilute, and the lower concentration makes the temperature lower.
• 2. Jeffery brings a book from air-conditioned apartment to a balcony on a hot summer day. How will the cool book interact with the outside air?
• Heat from the book will move to the air.
• Heart from the air will move to the book.
• Coolness from the book will move to the air.
• Coolness from the air will move to the book.
Heat Transfer:
• Whenever the temperature of an object or substance changes, heat is being transferred. It travels only in one direction (Hot to Cold) and by three different methods. Heat is transferred from warmer areas to cooler areas by conduction, convection, and radiation.

Crust forming on the surface of lava is an example of a change of state by transferring heat from the hot lava to the cooler air surrounding the lava.

Methods of Heat Transfer
• Think-Pair-Share!!
• Discuss examples of each type of heat transfer with a partner for two minutes.
Methods of Heat Transfer

Conduction:

Heat transferred by touching

Convection: Heat transferred by the motion of a substance

Radiation: Heat transferred through as waves through space

Where does heat transfer on this beach?

Label at least four examples of heat transfer on the picture.